As the mouse cursor is positioned above any cell of an item in the tree control, the cell in the first displayed column can be shown underlined. If a selection style is used that uses a rounded outline rectangle with a gradient fill, the cell text is not underlined. Instead, a rounded outline rectangle with a gradient fill is used to highlight the item, based on the current selection style (see GetSelectionStyle).

Flyby highlighting helps users easily identify where the mouse cursor is located in a multi-column tree control.

Flyby highlighting can be enabled using SetFlyby.